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Chapter 1

Populations and Communities

organism a living thing
habitat an enviroment that provides the things for an organism to live
biotic factor a living part of an organisms habitat
photosynthesis the process in which an organism uses water along with sunlight and carbon dioxide
abiotic factors nonliving part of an organisms habitat
species a group of organisms that are physically similar and can mate
population all the members of one species in a particular area
community all the different populations that live together
ecosystem the community of organisms that live in an area
ecology the study of how living things interact with each other and their environment
estimate an approximation of a number based on reasonable assumptions
birth rate the number of births in a population
death rate the number of deaths in a population
immigration moving into a population
emigration leaving a population
population density the number of individuals in an area of specific size
natural selection individuals whose unique characteristics are best suited for their environment tend to survive and produce offspring
adaptions the behaviors and physical characteristics that allow organisms to live successfully in their environment
niche the type of food the organism eats , how it obtains this food, sandwich other organism as food
competition the struggle between organisms to survive as they attempt to use the same limited resource
predator the organism that does the killing
predation an interaction in which one organism kills another
prey the organism that is killed
symboisis a close relationship between two species that benifits at least one of the species
mutalism a relationship in which both species benifit
commensalism a relationship in wich one species benifits and the other species is neither harmed nor helped
parasitism one organism living on or inside another organism and harming it
parasite the organism that benifits
host the organism that it lives on or is in
succesion the series of predictable changes that occur in a community over time
primary succesion the series of changes that occur in in an area where no soil or organisms exist
pioneer species the first species to populate an area
secondary succesion the series of changes that occur in an area where the ecosystem has been disturbed but soil and organisms still exist
Created by: isbrennan